Edge holding device for sheet glass



J. H. FOX ET AL EDGE HOLDING DEVICE FOR SHEET GLASS Filed NOV. 30, 1923 3 Sheets-Sheet 1 'J. H. FOX ET AL E1563 flowiue DEVICE FDR SHEET GLASS Filed Nov. 30, 1925- sheets-sheet 2 Dec. 6, 924.

.1 H. FOX ET AL EDGE HOLDING DEVICE FOR SHEET GLASS 3 Sheets-Sheet 3 Filed Nov. -30, 1923 Patented Dec. 16, 1924.

1,519,247 PATENT OFFICE.

JOHN H. FDX.AND'JOSEPH H. REDSHAW, 0F PITTSBURGH; PENNSYLVANIA, ASSIGNGrm TO PITTSBURGH PLATE GLASS COMPANY, A CORPORATION OF PENNSYLVANIA.

EDGE HOLDING DEVICE FOR SHEET GLASS Application filed November 30, 1928. Serial No. 677,655.

To all whom it may concern:

Be it known that we, JOHN H, Fox.and JOSEPH H. REDSHAW, citizens of the -I Jnited States, and residents'of Pittsburgh, 1n the county of Allegheny and State of Pennsylvania, have made a new and useful invention in Improvements in an Edge-Holding Device for Sheet Glass, of'which the following is a specification.

. The invention relates to apparatus for use with a sheet drawing machine and particularly to the type shown in the application of Harry G. SlinglulL'Serial No. 621,186, filed February 26th, 1923, which involves the use of stroking fingers operated from a suitable drivin means or motor and adapted to straddle the edges of the sheet at its base to thin them and prevent them from gradually working inward. The object of the presentinvention is the provision of an improved arrangement whereby the path of movement of the stroking lingers may be adjusted within a wide range to give exactly the line of movement best suited to the varying conditions encountered, and the provision of means whereby the necessary adjustments may be made with great ease and rapidity thus permitting the operator to exercise supervision over a maximum number of machines. Certain embodiments of theinverr tion are illustrated in drawings wherein:

Figure 1 is a diagrammatic side elevation showing the drawing apparatus with which the edge holding device constituting the present invention is preferably used, such drawing device being described and illustrated,

in the application of Harry G. Slinglufi, Serial No. 621,184. Fig. 2 is a side elevation of one of the edge holding devices in position of use. Fig. 3 is an end elevation of the device of Fig.2. And Fig. 4 is an enlarged detail section showing the method of swiveling the wheel for operating one of the adjusting rods.

Referring first to the general arrangement I of parts as illustrated in Fig. 1, the principal parts are as follows: 1 is the drawing tank, or extension, carrying a molten bath of glass 2 incommunication with the melt ing tank 3; 4 and 5 are endless belts, preferably of asbestos fabric for continuously drawing the sheet of glass 5 from the molten bath; 6 and 7 are the'driving pulleys for the belts, such pulleys being driven from a suitthe accompanying able motor, not shown; 8 and 9 are solid steel bars, circular in cross section, lying in the lower ends of the belts and serving by reason of their weight to hold the belts in tension; 10 are a series of rolls back of the inner flights of the bolts for pressing the belts against the glass, such rolls being yieldingly held inward by means of springs or weights, not shown; 11 and 12 are pairs of driven rolls covered with asbestos for. assisting in the pulling of the sheet; and 13 is one of the edge holding devices, to which the present invention is particularly directed, it being understood that such edge holding device may be used in connection with any form of drawing mechanism, although the one illustrated and described is preferred.

It will be understood that an edge holding device, such asthat shown in Fig. 2, is applied at each side of the sheet, but for brevity of description and illustration onlv one of such devices is shown and described. The device isjcarricd by a base plate 14 which also carries the motor 15 and casing 16 which houses the reducing mechanism. The drive shaft 17 which carries the operating cams 18 and 19 is mounted in the standard 20 and is driven from the motor 15 through the gears 21 and 22 and. the reducing mechanism in the casing 16.

Mounted upon the base plate 14: is a pair of upstanding lugs 23 upon which is pivoted an upright lever 24 made up of two side bars spaced apart as indicated in Fig. 3 and carrying atits upper end the pivot rod 25 upon which is mounted a second lever 26. This lever 24; is swung back and forth in a vertical plane by means of the cam 18 and the spring 26, the lever being provided with a roller 27 carried upon the pin 28 for engagement with the cam. The spring bears at its rear end against the nut 29 carried by the rod 30 which is secured to the lever by the pivot pin 31, while at its forward end it bears against the plate 32 carried by the bars 33 pivoted at their ends upon the pin 34, such pin extending through suitable lugs spring 41 interposed between its end and the lever 26. A rod 42 provided with an ad.- justing nut 43 serves to maintain the spring under compression, the lower end of this rod being formed into an eye 44 which'is engaged by the sprin 45. The spring 45 serves to hold the ro ler 36 on the lever 26 against the cam 19, the lower end of such spring being attached to the lever 24..

The member 37 is tubular in cross section and carries the bar 38 which is square in cross section for a portion of its len h to prevent its turning inthe member 37, iii: at its rear end is circular in cross section and threaded asindicated in Fig. it Mounted upon this threaded portion of the rod 38 is the adjusting hand wheel 39, such hand wheel being swiveled to the member 37 by means of the tongue 46 held in place by the screws 47 and engaging the groove 48 in the hub of the hand wheel. The forward end of the rod 38 is provided with a socket .to receive the rear end of, the stroking rod 39, such rod being held in position in the socket by means of the set screws 49. The lower end of the rod 39 is forked and recur'ved as indicated in Fig. 2 to provide the stroking fingeis 50 which straddle theedge of the sheet 5, being spaced apart a distance such that when in the position illustrated, they engage the thickened base of the sheet and serveto thin and hold it in position when given a proper path of movement. One path of movement which. may be given to these fingers is indicated by the dotted line A, this being the path of movement of the point B lying at the center of curvature of the fingers '50.

The roller 36 which engages the cam 19 is carried upon a pin 51' mounted in a pair of blocks 52. These blocks carry the threaded stem 53 and are guided in the U shaped lower end of the lever 26. Swiveled upon the lower end. of this lever is the hand wheel 54, the method of mounting such hand wheel being the same as that heretofore described and illustrated in Fig. l.

Intermediate the two cams 18 and 19, which are loose upon the shaft 17 is the plate 55, which is keyed to the shaft 17. This plate carries a pair of bolts 56 and 57 which extend-through slots 58 and .59 in the two cams. Upon loosening the nuts on these bolts, the cams may be given an adjustment about the shaft 7 17 This adjustment provides a means for varying the path of movement A of the stroking fingers, so that any desired travel for securing the best results may be had depending upon the conditions which are encountered. The position of the fingers 50 with respect to the bath and with respect to the edge of the sheet may also be adjusted by means of the hand wheels 39 and 54, the hand wheel 39 serving to adjust the fingers in a horizontal mas er the position of the stroking fingers may be very quickly and easily adjusted to accommodate the machine to varying conditions. The ease with which these adjustments may be made permits the use of a single operator for a number of machines, Adjustments as provided for by the cams and hand wheels gives a range of movement of the stroking fingers such that the hand stroking operation may be very closely approxi mated with the advantage for the machine that the stroking is more regular and at a much lower cost than the hand operation.

What I claim is: 1. In combination with apparatus for drawing a glass sheet from a molten bath, a

lever arm mounted for swinging movement toward and from-the sheet in a vertical plane, a second lever mounted on the first lever transversely thereof for swinging movement also in a vertical plane, -a pair of fingers spaced apart to straddle the ode of the sheet and carried by said seconc lever, a cam for swinging each lever, and means for rotating the cams.

2. In combination with apparatus for drawing a glass sheet from a molten bath, a lever arm mounted for swinging movement toward and from the sheet in a vertical plane, a second lever mounted on the first lever transversely thereof for swingingmovcment also in a vertical plane, a pair or fingers spaced apart to straddle the edge of the sheet and carried by said second lever, a cam for swinging each lever, yielding means in said second lever, and means for rotating the cams.

3. In combination with apparatus for drawing a glass sheet from a molten bath, a lever arm mounted for swinging movement toward and from the sheet in a vertical plane, a second lever mounted'on the first lever transversely thereof for swinging movement also in a vertical plane, a pair of fingers spaced apart to. straddle the edge of the sheet and carried by said second lever, a cam for swinging each lever, and means for rotating the cams, the cams being mounted for rotary adjustment.

4. In combination with apparatus for.

drawing a glass sheet from a molten bath,

a lever arm mounted for swinging movement toward and from the sheet in a vertical plane, a second lever mounted on the atlases first lever transversely thereof for swinging movement also in a vertical plane, a pair of fingers spaced apart to straddle the edge of the sheet and carried by said second lever, a cam for swinging each lever, a drivingishaft on which both cams are mounted, and means whereby one of said cams may be adjusted about said shaft.

5. In combination with apparatus for drawing a glass sheet from a molten bath,

a lever arm mounted for swinging movement toward and from the sheet in a vertical plane, a second lever mounted on the first lever transversely thereof for swinging movement also in a vertical plane, a pair of fingersspaced apart to straddle the edge of the sheet and carried by said second lever, a cam for swinging each lever, a driving shaft on which both cams are mounted, and means whereby both of said cams may be adjusted about said shaft.

6-. In combination with apparatus for drawing a glass sheet from a molten bath, a lever arm mounted for swinging movement toward and from the sheet in a vertical plane, a second lever mounted on the first lever transversely thereof for swinging movement also in. a vertical plane, a pair of fingers spaced apart to straddle the edge of the sheet and carried by said a cam for screw adjustments carried by the second lever, one for moving the fingers toward and from the sheet, and the other for swinging it about its support on the first lever, and means for rotating the cams.

7. In combination with apparatus for drawing a glass sheet from a molten bath, alever arm mounted for swinging movement toward and from the sheet in a 'vertical plane, a second lever mounted on the first lever transversely thereof for swinging movement also in a vertical plane, a pair of fingers spaced apart to straddle the edge of the sheet and carried by said second lever, a cam for swinging each lever, a pair of screw adjustments, including threaded stems and hand wheels lever, one for moving the fingers toward second lever,

' and from the sheet, and the other for swinging it about its support on the first lever, a nd means for rotating the cams. i

JOHN H. FOX.

JOSEPH H. REDSHAW.

swin in each lever a air of b 7 carried by the second 

